diff --git a/core/src/test/scala/org/apache/spark/util/UtilsSuite.scala b/core/src/test/scala/org/apache/spark/util/UtilsSuite.scala
index baa4c661cc21e..251a797dc28a2 100644
--- a/core/src/test/scala/org/apache/spark/util/UtilsSuite.scala
+++ b/core/src/test/scala/org/apache/spark/util/UtilsSuite.scala
@@ -486,11 +486,17 @@ class UtilsSuite extends SparkFunSuite with ResetSystemProperties with Logging {
 
   // Test for using the util function to change our log levels.
   test("log4j log level change") {
-    Utils.setLogLevel(org.apache.log4j.Level.ALL)
-    assert(log.isInfoEnabled())
-    Utils.setLogLevel(org.apache.log4j.Level.ERROR)
-    assert(!log.isInfoEnabled())
-    assert(log.isErrorEnabled())
+    val current = org.apache.log4j.Logger.getRootLogger().getLevel()
+    try {
+      Utils.setLogLevel(org.apache.log4j.Level.ALL)
+      assert(log.isInfoEnabled())
+      Utils.setLogLevel(org.apache.log4j.Level.ERROR)
+      assert(!log.isInfoEnabled())
+      assert(log.isErrorEnabled())
+    } finally {
+      // Best effort at undoing changes this test made.
+      Utils.setLogLevel(current)
+    }
   }
 
   test("deleteRecursively") {